Revert of Un-nest configs in GN files.

third_party/yasm/BUILD.gn

Index: third_party/yasm/BUILD.gn
diff --git a/third_party/yasm/BUILD.gn b/third_party/yasm/BUILD.gn
index b301a10b8b0b4679cf58520bd156abcac1c439f7..fcb779ac82b04ba7c2e85a75b4e869f746b9bddc 100644
--- a/third_party/yasm/BUILD.gn
+++ b/third_party/yasm/BUILD.gn
@@ -135,20 +135,6 @@
     ]
   }
 
-  config("re2c_warnings") {
-    # re2c is missing CLOSEVOP from one switch.
-    if (is_clang) {
-      cflags = [
-        # re2c is missing CLOSEVOP from one switch.
-        "-Wno-switch",
-
-        # re2c contains many static functions in headers (because it's
-        # a C library predating C99.)
-        "-Wno-unused-function",
-      ]
-    }
-  }
-
   executable("re2c") {
     sources = [
       "source/patched-yasm/tools/re2c/actions.c",
@@ -162,24 +148,28 @@
       "source/patched-yasm/tools/re2c/translate.c",
     ]
 
-    configs -= [ "//build/config/compiler:chromium_code" ]
-    configs += [
+    config("re2c_warnings") {
+      # re2c is missing CLOSEVOP from one switch.
+      if (is_clang) {
+        cflags = [
+          # re2c is missing CLOSEVOP from one switch.
+          "-Wno-switch",
+
+          # re2c contains many static functions in headers (because it's
+          # a C library predating C99.)
+          "-Wno-unused-function",
+        ]
+      }
+    }
+    configs -= [ "//build/config/compiler:chromium_code" ]
+    configs += [
+      ":yasm_config",
+      "//build/config/compiler:no_chromium_code",
       ":re2c_warnings",
-      ":yasm_config",
-      "//build/config/compiler:no_chromium_code",
-    ]
-    deps = [
-      "//build/config/sanitizers:deps",
-    ]
-  }
-
-  config("yasm_warnings") {
-    if (is_clang) {
-      cflags = [
-        # reg3264type in x86expr.c is unused.
-        "-Wno-unused-local-typedef",
-      ]
-    }
+    ]
+    deps = [
+      "//build/config/sanitizers:deps",
+    ]
   }
 
   executable("yasm") {
@@ -268,10 +258,19 @@
     configs -= [ "//build/config/compiler:chromium_code" ]
     configs += [
       ":yasm_config",
-      ":yasm_warnings",
       "//build/config/compiler:no_chromium_code",
       "//build/config/compiler:no_incompatible_pointer_warnings",
     ]
+
+    config("yasm_warnings") {
+      if (is_clang) {
+        cflags = [
+          # reg3264type in x86expr.c is unused.
+          "-Wno-unused-local-typedef",
+        ]
+      }
+    }
+    configs += [ ":yasm_warnings" ]
 
     # Yasm generates a bunch of .c files which its source file #include.
     # Add the |target_gen_dir| into the include path so it can find them.